Electron discharge device



July 19, 1949. E. G. LINDER I ELECTRON DISCHARGE DEVICE Filed Feb. 7, 1945 1N VEN TOR. Em fir 6f L/m m Ida Patented July 19, 1949 2,415,611: Emerson mscnnncn-nnvrcn Ernest (3r.v Linden lrincetonylhl s J'., assigno'cuto:

Radio Corporation of of Delaware America; atcorporatibm.

Application February 7, 1915', SerialNo. 576,549

Claims; (C15525fle-225 Myinvention relates to electron discharge devices, particularly to magnetrons useful at ultra high frequencies.

In. certain types of magnetrons the anode'islof thetuned tank circuit type enclosed within-the envelope of :the device. be in: the shape of a U, provides at its openends the-.anode segments surrounding the cathode. Thus in this arrangement the ends of the circuit removed from the anode segments are short circuitedsothata voltage node is produced'at this point and a voltage maximum at the open ends of the legs where the anode segments are 13051? tioned.

It an object of my invention to provide a The anode, which may 7 magnetron of improved design and useful at ultra high frequencies.

A: further object of my invention is to provide such an improved magnetron of the internal tuned circuit type.

More particularly it is an object of myinvention to provide a magnetron of the internal tunedtank circuit type having an improved type oftank circuit. 7

The novel features which I believe to-be characteristic of my invention are set forth with particularity in the appended claims, but the inven-- tion itself. will best be understood by reference tdthe following description taken in connection with the accompanying drawing in which Figure Lisaside elevation view of a magnetronamade according to myinvention, Figure 2.is a view turned 90 with respect to Figure 1, Figure :3.is a-llongitudinal section of Figure 2, Figure 4 ista transverse section along the line 4-4 of Figure l, and Figure 5 is an enlarged perspective. of the anode tank circuit made according. to my invemtion.v

A. magnetron made according to my invention lsprovided with the usual evacuated envelope! provided with press II from which extend sup.- port and lead wires l2, l3, l4 and [5.

Supported at the upper ends of the lead and support wires I2 and I5 is a filamentary cathode l6." These support wires also serve as leads for the heating current. An anode I! made accord ing to my invention surrounds the cathode and istsupported by the lead 14. A shield l8 surrounding the anode is provided with apertures through which the cathode filament extends. This shield acts as an end shield as described in an article Description and characteristicsof the end plate magnetron, by ErnestG. Linderin thePrOceedingS of the Institute of RadiouEngineers, April 1936, page 633. The function of the end plates is to withdraw electrons from the cathode-anode space at an optimum rate. The wires I9 and are electrically connected to theanodeby means of the leads [9. and 20' and may be utilized as a transmission line or a part of a Lecher wire system. The usual getter 9 is used.

In accordance with'my invention and as shown in greater detail 111""1523195, I make the anode tank circuit il in the form of an L-shaped element having-a slot 2i extending entirely through one-legend'partiallyinto the other leg thereof and having opposed. arcuate shaped-surfaces on the-opposedinner faces of the spaced leg. por tions 22 and 23410 provide a cylindrical central chamber albng theaxis of which the cathode i6 is supported. The leads-19 and 20' are connected tothe leg portions 22 and'23', whichprovide parable't elongatedanode segments of the magnetron". Az'magnet having poles 25 and 2B provides the magnetic field between cathode and .anode' segments. Thusethe elongated Janode segments 22 and 23 have an integral conducting loop-joining thesegm'ent'sat oneuendxthereof; the loop and the lengthofathesegments determining the ele'c-;- tricalalengtir of the tank-circuit. Withtheuar rangement. shown, the voltage maximum: appears neartheends of anode segments 22 and-23xremovedfrem: this conducting loop;

Witnthe arrangement shown, a-tube of relatively smalr diameter :may be utilized, thus per.- mittingthe'use of a small magnet. This con! struction enhances the action of the :end: plates, renders-them morei-efiectiveand increases the eftlciency of; the device, since electron emission to inefieetivesections of the anode is prevented.

In one form-of.- device designed tooperate from 3,-to4 centimeters, the anode segments measured .lfiil-inchand the legformi-ng the conducting loop,measuredi.245 inch in length. Voltages on the anode varied from 590 to 790 volts.

While-I have indicated the preferred embodiments of my inventionof which I am now aware andhave alsoindicated only one specific applicationlfor which my invention may be employed,- itwilllbe apparent thatmy invention is by no meanslimitedto the exact forms illustrated or the use indicated, but that many variations may bemadeintheparticular structure-used and the purpose fcrwhich it-is employed without departing from. the (scope of'my invention as set forth in the appended claims.

7 What I- claim-as new is:

l. electron discharge device 1 having an anede comprising an -:L-shaped member having a slot. extending entirely through one leg. and par tially into the @othezvproviding. a pair of 'oppo sitely. disposedcL-shaped elements, one pair 0! oppositely 1 disposedelements:v being joined .t0 gather at one'end, the; other legs of said elements being spaced apart'and-providing oppositely dis posed .anodesegmentsand' cathode means adjacent saidanode. segments for providing elece trons .insthe space between the" anode segments, and means adjacent said anode segments for providing a. magnetic .field between said anode seg-; ments and parallel to the legs forming said anode segments? into the other providing a pair of oppositely dis-- posed L-shaped elements, one pair of oppositely disposed elements being joined together at one end, the other legs of said elements being spaced apart and providing oppositely disposed anode segments and cathode means adjacent said anode segments for providing electrons in the space between the anode segments, and means adjacent said anode segments for providing a magnetic field between said anode segments and parallel tothe legs forming said anode segments, the opposing surfaces of said anode segments being concave. Y Y

' 3. An electron discharge device including a pair pf L-shaped elements having two pairs of oppositely disposed registering parallel legs one of said pairs of oppositely disposed legs being connected together at one end, the other pair of oppositely disposed legs being spaced apart and having oppositely disposed concave surfaces and providing anode segments enclosing a space, cathode means adjacent said anode segments for providing electrons within said space and means adjacent said anode segments for providing a magnetic field along the axis of said space and within said space. a 4. An electron discharge device including a pair of oppositely disposed registering L-shaped elements, one of the pairs of oppositely disposed legs of said L-shaped elements being connected together at one end. the other pair of oppositely disposed legs being spaced apart and having oppositely disposed concave surfaces and providing anode segments enclosing a space, cathode means adjacent said anode segments providing electrons within said space and means adjacent said anode segments for providing a magnetic field along the axis of said space and within said space, and a shield surrounding the anode segments.

5. An electron discharge device including a pair of oppositely disposed elongated elements in parallel spaced relationship and providing anode segments, and a conducting loop connected between said elements at one end only thereof and lying transversely to the longitudinal axis of said elements, cathode means adjacent said anode segments for providing electrons within said space between said elements and means adjacent said anode segments forproviding a magnetic field within said space and parallel to the longitudinal axis of said elements.

6. An electron discharge device including a pair of oppositely disposed elongated elements in spaced parallel relationship and having oppositely disposed concave surfaces providing anode segments, and a conducting loop connected between said elements at one end only thereof and lying transversely to the longitudinal axis of said elements, cathode means adjacent said anode segments for providing electrons within said space between said concave surfaces and means adjacent said anode segments for providing a magnetic field within said spaceand parallel to the longitudinal axis of said elements.

7. An electron discharge device including an L- shaped conducting member, said L-shaped conducting member having a rectangular transverse section and a slot extending through one of the legs thereof and partially into the other leg whereby oppositely disposed leg portions are pro- 4 vided, the opposing surfaces of said leg portion providing a chamber having a circular transverse section and said leg portions providing anode segments, a cathode lying along the axis of said chamber, and means adjacent said anode segments for providing a magnetic field parallel to said cathode and between said cathode and said opposing surfaces.

8. An electron discharge device including an L- shaped conducting member, said L-shaped conducting member having a rectangular transverse section and a slot extending through one of the legs thereof and partially into the other of said legs whereby oppositely disposed leg portions are provided, the opposing surfaces ,of said leg portions providing a chamber having a circular transverse section and said leg portions provid-i inganode segments, a cathode lying along the axis of said chamber, means adjacent said anode segments for providing a magnetic field parallel to said cathode and between said cathode and said opposing surfaces, and a shield surrounding said anode segments.

9. An electron discharge device including a. tuned tank circuit comprising a pair of oppositely disposed spaced L-shaped members, said members being connected together at the outer end of one leg thereof, the other legs of said members being spaced apart and having arcuate shaped opposing surfaces providing a chamber having a circular transverse section, said spaced legs providing anode segments, a cathode mounted axially of said chamber between said arcuate shaped surfaces and means adjacent said anode segments for providing a magnetic field parallel to said cathode and between said cathode and said arcuate shaped surfaces, and a lead connected to each of said spaced legs adjacent the free ends thereof providing a transmission line.

0. An electron discharge device including a tuned tank circuit comprising a pair of oppositely disposed spaced L-shaped members, said members being connected together at the outer end of one leg thereof, the other legs of said members being spaced apart and having arcuate shaped opposing surfaces providing a chamber having a circular transverse section, said spaced legs providing anode segments, a cathode mounted axially of said chamber between said arcuate shaped surfaces and means adjacent said anode segments for providing a magnetic field parallel to said cathode and between said cathode and said arcuate shaped surfaces, and a lead connected to each of said spaced legs adjacent the free ends thereof providing a transmission line, and a tubular conducting member surrounding said anode segments providing an end shield.

ERNEST G. LINDER.

REFERENCES CITED The following referenlces are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,063,342 Samuel Dec. 8, 1936 2,075,855 Kilgore Apr. 6, 1937 2,151,912 Habann et a1 Mar. 28, 1939 FOREIGN PATENTS Number Country Date 443,077 Great Britain Feb. 20, 1936 

